JPS60234061A - Hydraulic brake controller for car - Google Patents

Abstract

PURPOSE:To reduce the number of parts by installing a casing which has two cylinder parts having equal diameter and is installed concentrically, having a partitioning wall therebetween, into an oil passage between a master cylinder and a wheel brake and installing a valve mechanism equipped with the function of a proportional control valve into the partitioning wall. CONSTITUTION:A casing 4 is installed between an oil passage 2 connected to a master cylinder M and an oil passage 3 connected to a wheel brake B, and in said casing 4, the first and the second cylinder parts 13 and 14 into which pistons 15 and 19 are installed in slidable ways are installed concentrically through a partitioning wall 10. The inside of the first cylinder part 13 is divided into an input hydraulic chamber 16 and a control chamber 18 by the piston 15, and the inside of the second cylinder part 14 is divided into an output hydraulic chamber 20 and a spring chamber 22 by the piston 19 having the equal diameter to that of the piston 15. The both pistons 15 and 19 are fixed at the both edges of a piston rod 25 penetrating through the partitioning wall 10. A valve mechanism 5 which is closed according to the separating operation of the piston 19 from the partitioning wall 10 is installed onto the partitioning wall 10.

Description

Detailed Description of the Invention A9 Object of the Invention (11 Industrial Field of Application) The present invention relates to a vehicle brake hydraulic pressure control system, in particular an input hydraulic chamber communicating with an output port of a mask cylinder, and an input hydraulic chamber communicating with a wheel brake. and an output hydraulic chamber that generates braking hydraulic pressure corresponding to the hydraulic pressure of the output hydraulic chamber. The present invention relates to a vehicle brake hydraulic control device configured to increase in volume.

(2) Conventional technology Conventionally, such vehicle brake hydraulic control devices operate a piston according to the oil chamber of the input hydraulic chamber to reduce the volume of the output hydraulic chamber, thereby controlling the braking pressure corresponding to the input hydraulic chamber. is generated from the output hydraulic chamber, and during anti-lock control, the control hydraulic pressure supplied to the control chamber operates the piston in the opposite direction to that described above to increase the volume of the output hydraulic chamber.

(3) Problems to be Solved by the Invention In the conventional vehicle brake hydraulic control device described above, the braking hydraulic system is separated into one from the mask cylinder to the input hydraulic chamber and the other from the output hydraulic chamber to the wheel brake. Therefore, when supplying hydraulic oil to the braking hydraulic system, it is necessary to fill both of them with hydraulic oil, respectively. In addition, the piston is always in operation when the brake is operated, and the number of strokes is large, resulting in poor durability.

The present invention has been made in view of the above circumstances, and provides a brake hydraulic control for a vehicle that allows the hydraulic oil to be filled in the brake hydraulic system at one time, reduces the number of strokes of the piston, and improves durability. The purpose is to provide equipment.

B0 Structure of the Invention ill Means for Solving Problems In the present invention, a first cylinder portion and a second cylinder portion are provided concentrically in a casing with a partition wall interposed therebetween, and the first cylinder portion is provided with the partition wall. A first piston that defines an input hydraulic chamber on one side and defines the control chamber on the opposite side of the partition wall is slidably connected to the second cylinder portion, and a second piston that defines an output hydraulic chamber on the partition wall side and a partition wall. A second piston defining a spring chamber on the opposite side and having the same diameter as the first piston is slidably connected to the first piston.
and a second piston is fixed to each end of a piston rod that liquid-tightly and movably penetrates the partition wall, and a valve is provided in the partition wall to close the valve in response to movement of the second piston away from the partition wall. A valve mechanism is provided in the spring chamber, and a second valve mechanism is provided in the spring chamber.
A spring is housed therein which biases the piston toward the partition wall.

(2) Effect According to the above configuration, when the anti-lock control means is not activated, the second piston is displaced toward the partition wall by the spring force, the valve mechanism opens, and a hydraulic path from the mask cylinder to the wheel brake is formed. , the brake hydraulic system can be filled with hydraulic oil all at once. Furthermore, the first and second pistons do not operate when the anti-lock control means is not activated, reducing the number of strokes.

(3) Example Hereinafter, an example of the present invention will be described with reference to the drawings.The oil passage 2 extending from the output port l of the mask cylinder M
and an oil path 3 leading to the wheel brake B attached to the wheel W.
A casing 4 is provided between the two. This casing 4
A valve mechanism 5 provided therein functions to transmit the braking hydraulic pressure from the mask cylinder M to the wheel brake B when the brake is operated, and is supplied from the anti-lock control means 6 when the wheel W is about to enter the locked state. The anti-lock control hydraulic pressure closes the valve and serves to cut off the supply of braking hydraulic pressure from the mask cylinder M to the wheel brakes B.

Inside the casing 4, there is a hole 7 that is open at the top and extends vertically.
A cylindrical partition member 8 with a bottom is inserted into the hole 7 with an O-ring 9 interposed between it and the inner surface of the hole. Moreover, the partition member 8 is inserted halfway into the hole 7 with its bottom as a partition wall 10 facing downward, and is supported by a step 11 provided facing upward in the middle of the hole. A cap 12 is screwed onto the open end of the hole, and the cap 12 is tightened until it comes into contact with the open end of the partition member 8 and presses the partition member 8 against the stepped portion 11. In this way, inside the casing 4, the lower first cylinder part 13 and
An upper second cylinder portion 14 is provided concentrically with the partition wall 10 interposed therebetween.

A first piston 15 is slidably connected to the first cylinder portion 13 . An input hydraulic chamber 16 is defined between the first piston 15 and the partition wall 10, and the input hydraulic chamber 16 is connected to the casing 4.
It communicates with the oil passage 2 through an inlet oil passage 17 bored on the side surface of the oil passage 2 . In addition, regarding the first piston 15, the input hydraulic pressure chamber 16
On the opposite side, the first piston 15 and the first cylinder part 13
A control room 18 is defined by the end wall of.

A second piston 19 having the same diameter as the first piston 15 is slidably connected to the second cylinder portion 14 . An output hydraulic pressure chamber 20 is defined between the second piston 19 and the partition wall 10, and the output hydraulic pressure chamber 20 is connected to an oil passage through an outlet oil passage 21 provided across the side wall of the partition member 8 and the casing 4. 3. Further, a spring chamber 22 open to the atmosphere is defined between the second piston 19 and the camp 12, and a spring biasing the second piston 19 toward the partition wall IO side is contained in the spring chamber 22. 23 is accommodated.

A piston rod 25 is inserted through a through hole 24 bored in the center of the partition wall 10 so as to be freely movable in the axial direction, and the first and second pistons 15.1 are attached to both ends of the piston rod 25.
9 are fixedly installed respectively.

Furthermore, an O-ring 26 is fitted into the inner surface of the through hole 24 and is fitted into the outer circumferential surface of the piston rod 25.
The input hydraulic pressure chamber 1 is connected to the input hydraulic pressure chamber 1 through a gap between the outer surface of the
6 and the output hydraulic chamber 20 are never communicated with each other.

A valve mechanism 5 is provided in the partition wall 10 . This valve mechanism 5 includes a valve chamber 2 provided in a partition wall 10 and communicating with an input hydraulic pressure chamber 16.
7, a valve hole 28 provided between the valve chamber 27 and the output hydraulic chamber 20, a spherical valve body 29 housed in the valve chamber 27 to open and close the valve hole 28, and a valve body 29 provided integrally with the valve body 29. The drive rod 30 extends through the valve hole 28 and projects into the output hydraulic chamber 20, and a spring 31 is housed in the valve chamber 27 and urges the valve body 29 toward the valve hole 28. A conical valve seat 32 is provided on the end face of each of the valve holes 28 of the valve chamber 27, and the diameter thereof becomes smaller toward the valve hole 28 side. Further, the length of the drive rod 30 is set to a value sufficient to push the valve body 29 away from the valve seat 32 by being pressed by the second piston 19 when the second piston 19 is displaced to the maximum extent toward the partition wall 10. be done.

The anti-lock control means 6 includes a hydraulic pressure source 33, a first electromagnetic valve 34 that is closed during normal times, and a second electromagnetic valve 35 that is open during normal times. The hydraulic pressure source 33 includes a hydraulic pump 36 that pumps control fluid, such as pressure oil, from the reservoir R, and an accumulator 37. The hydraulic pump 36 is always driven when the vehicle is operating. Further, a pressure gauge 38 is attached to the hydraulic pressure source 33.

The first solenoid valve 34 and the second solenoid valve 35 are arranged in a valve face 39, which is integrated into the casing 4. On the valve face 39, there is.

A first valve hole 40, a first valve chamber 41, a second valve hole 42, a second valve chamber 43, and an oil passage 44 are bored in this order from the bottom to the top, and are connected to the hydraulic pressure source 33. The oil passage 45 is connected to the first valve hole 40 via a supply oil passage 46 bored in the casing 4.
will be communicated to. Further, the oil passage 44 is communicated with the reservoir R via an open oil passage 47 bored in the casing 4. The first solenoid valve 34 is connected to a first valve chamber 41 to open and close a first valve hole 40.
This first valve chamber 41 is communicated with the control chamber 18 via an oil passage 48 provided in the casing 4 . Further, the second valve hole 42 also communicates with the first valve chamber 41, and the second valve hole 42 also communicates with the first valve chamber 41.
The solenoid valve 35 is housed in the second valve chamber 43 to open and close the second valve hole 42 .

The first solenoid valve 34 is closed during normal times, and the second solenoid valve 35 is open during normal times. However, when a sensor (not shown) detects that the wheel W is about to enter a locked state, the first solenoid valve Solenoid valve 34 opens and second solenoid valve 35 closes. Therefore, during normal times, the control chamber 18 is communicated with the reservoir R, and when the wheels W are about to enter a locked state, the anti-lock control hydraulic pressure from the hydraulic pressure source 33 is supplied to the control chamber 18.

Next, to explain the operation of this embodiment, when the brake pedal Bp is not operated and is not operated, the second piston 19
is displaced downward by the spring force of the spring 23 until it comes into contact with the partition wall 10, and in the valve mechanism 5, the drive rod 3
0 is pressed by the second piston 19, the valve body 29 is separated from the valve seat 32, and the valve is opened. Therefore, from the output capo 1 of the mask cylinder M to the oil passage 2, the inlet oil passage 17,
Input hydraulic chamber 16, valve chamber 27, valve hole 28, output hydraulic chamber 20
, a hydraulic path leading to the wheel brake B via the outlet oil passage 21 and the oil passage 3 is formed. This makes it possible to extremely easily fill the brake hydraulic system with hydraulic oil, similar to a brake hydraulic system that does not include the valve mechanism 5 for anti-lock control.

That is, conventionally, the input hydraulic pressure chamber 16 is connected from the mask cylinder M.
and the hydraulic path from the output hydraulic chamber 20 to the wheel brake B.
In contrast, the braking hydraulic pressure path from the mask cylinder M to the wheel brake B is established, whereas it was necessary to fill the hydraulic oil separately from the hydraulic path from the mask cylinder M to the wheel brake B.
By filling the hydraulic oil from the mask cylinder M side, the filling of the hydraulic oil up to the wheel brakes B is completed. Furthermore, in the casing 4, the input hydraulic chamber 16 is located below the partition wall 10, and the output hydraulic chamber 20 is located above the partition wall 10.
Since the hydraulic oil flows upwards, it becomes extremely easy to bleed air.

When a brake operation is performed using the brake pedal Bp, braking oil pressure from the output port 1 of the mask cylinder M is supplied to the wheel brakes B via the hydraulic path. At this time, since the control hydraulic pressure from the anti-lock control means 6 is not supplied to the control chamber 18, the second piston 19 remains displaced to the maximum extent toward the partition wall 10 by the spring force of the spring 23.
The valve mechanism 5 remains open. In this way, the brake hydraulic pressure is directly supplied from the mask cylinder M to the wheel brake B, so the piston stroke switch that was conventionally provided to detect leakage of brake hydraulic pressure is omitted, and an anti-lock control function is provided. Hydraulic pressure leaks can be detected using the same means as with brake hydraulic systems that do not have a brake hydraulic system.

During brake operation, when the braking force becomes excessive and the wheels W are about to enter a locked state, the first solenoid valve 34 opens and the second solenoid valve 35 closes. A control hydraulic pressure is supplied, and the first piston 1
5 is pushed upward against the downward force generated by the spring 23 and the hydraulic pressure of the input hydraulic chamber 16. Along with this, the second piston 19 separates from the partition wall 10, so the valve body 29 of the valve mechanism 5 seats on the valve seat 32 and closes, cutting off the supply of braking hydraulic pressure to the wheel brakes B. This prevents the wheels W from entering the locked state, but if the wheels are still likely to lock, the control fluid pressure in the control chamber I8 further increases, and the first piston 15 moves further upward. Therefore, the volume of the output hydraulic chamber 20 increases, the braking hydraulic pressure acting on the wheel brake B decreases, and the wheels W are reliably prevented from entering the locked state.

In this embodiment, the valve surfaces 39 of the first and second electromagnetic valves 34 and 35 are integrated into the casing 4, which allows for a compact overall structure.

C6 Effects of the Invention As described above, according to the present invention, the first cylinder part and the second cylinder part are provided concentrically in the casing via the partition wall, and the first cylinder part has an input hydraulic pressure on the partition wall side. A first piston that defines a chamber and a control chamber on the opposite side of the partition wall is slid together, and the second cylinder part has an output hydraulic chamber on the partition wall side and a spring chamber on the opposite side of the partition wall. and a second piston having the same diameter as the first piston is slidably fitted, the first and second pistons are respectively fixed to both ends of a piston rod that fluidly and movably penetrates the partition wall, The partition wall is provided with a valve mechanism that closes the valve in response to the movement of the second piston away from the partition wall, and the spring chamber accommodates a spring that biases the second piston toward the partition wall. When the lock control means is not activated, the second piston is maximally displaced toward the partition wall to keep the valve mechanism open, and a hydraulic path from the mask cylinder to the wheel brake is formed. Therefore, the braking hydraulic system can be filled with hydraulic oil all at once. Further, the first and second pistons do not operate when the anti-lock control means is not activated, but move by the necessary amount when the anti-lock control means is activated, thereby reducing the number of strokes and improving durability.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Output port, 4... Casing, 5... Valve mechanism, 6... Anti-lock control means, 10... Partition wall, 13... First cylinder part, 14... Second Cylinder part, 15... No. 1 piston, 16... Input hydraulic chamber, 1
8... Control room, 19... Second piston, 20...
Output hydraulic chamber, 22... Spring chamber, 23... Spring, 25
...Piston rod, B...Wheel brake, M...Mask cylinder, W...Wheel Showa 6 Hoko February 27th 1. Display of the case 1982 Patent Application No. 90718 3, Person making the amendment Relationship to the case Name of patent applicant (532) Honda Motor Co., Ltd. 4, Agent
Person 105 Telephone Tokyo 434-4151 5 Column 1 of "Detailed Description of the Invention" of the specification to be amended, page 8, line 2 of the specification, "The spring...is done" as follows. Correct it like this. A spring 23 that biases the spring is housed in the spring chamber 22. The air in the spring chamber 22 is compressed when the first piston 15, second piston 19, and piston rod 25 move upward, or due to temperature changes, etc. 2. Lines 7 to 14 on page 9 of the specification are corrected as follows. The anti-lock control means 6 includes a hydraulic pressure source 33 composed of a hydraulic pump 36 and an accumulator 37 that pump a control liquid, such as pressure oil, from a reservoir R, a first electromagnetic chamber 34 that is closed during normal times, and a first electromagnetic chamber 34 that is open during normal times. A second electromagnetic box 35 is provided, and a hydraulic switch 38 is provided for warning in the event of a failure of the hydraulic pressure source 36 or loss of control hydraulic pressure, or for detecting the start or stop of driving the hydraulic pump 36. 10th page, lines 14-15, ``1st
It says "Electronic... Close"...
"The second solenoid box 35 closes and the first solenoid valve 35 opens."・
Corrected to... 4. On page 13 of the specification, lines 1 and 2, there is a line that says, ``The first electromagnetic box 35 is...''. Closes and the first electromagnetic box 34 opens, so...
Corrected to... that's all

Claims (2)

[Claims] (1) It has an input hydraulic chamber that communicates with the output port of the mask cylinder, and an output hydraulic chamber that communicates with the wheel brake and generates braking hydraulic pressure corresponding to the hydraulic pressure in the input hydraulic chamber, so that the wheels are about to enter a locked state. In a vehicle brake hydraulic control device configured to increase the volume of an output hydraulic chamber in accordance with the supply of control hydraulic pressure from an anti-lock control means to a control chamber, a first cylinder portion and a second cylinder portion are provided in a casing. A cylinder part is provided concentrically with a partition wall in between, and a first piston that defines an input hydraulic pressure chamber on the partition wall side and defines the control chamber on the opposite side of the partition wall is slidably engaged with the first cylinder part. , the second cylinder part has an output hydraulic chamber defined on the partition wall side and a spring chamber defined on the opposite side to the partition wall;
A second piston having the same diameter as the piston is slidably connected to the piston, and the first and second pistons are respectively fixed to both ends of a piston rod that liquid-tightly and movably penetrates the partition wall. A brake hydraulic control for a vehicle, characterized in that a valve mechanism is provided that closes the valve in response to movement of the piston away from the partition wall, and the spring chamber accommodates a spring that biases the second piston toward the partition wall. Device. (2) The vehicle according to claim (1), wherein in the cylinder, an output hydraulic chamber is defined above a partition wall, and an input hydraulic chamber is defined below a partition wall. Brake hydraulic control device.